private static byte[] encryptSize(int size, int counter)
{
int i;
byte[] encrypted = new byte[64];
byte[] tempData = new byte[64];
byte[] plaintext = new byte[64];
byte[] encryptKey = Encoding.UTF8.GetBytes("----KEY_HERE----");
byte[] encryptIV = Encoding.UTF8.GetBytes("-----IV_HERE----");
tempData = Encoding.UTF8.GetBytes(size.ToString());
//Do we need to pad the data?
if (tempData.Length != 64)
{
Array.Copy(tempData, plaintext, tempData.Length);
for (i = tempData.Length; i < (plaintext.Length - tempData.Length); i++)
{
plaintext[i] = 0x00;
}
}
else
{
plaintext = tempData.ToArray();
}
encryptIV[(counter % 16)]++;
Aes128CounterMode am;
ICryptoTransform ict;
am = new Aes128CounterMode(encryptIV);
ict = am.CreateEncryptor(encryptKey, null);
ict.TransformBlock(plaintext, 0, 64, encrypted, 0);
return(encrypted);
}
private static int decryptStatus(byte[] status, int counter)
{
int ret = -1;
string s;
byte[] tempData = new byte[64];
byte[] decryptKey = Encoding.UTF8.GetBytes("----KEY_HERE----");
byte[] decryptIV = Encoding.UTF8.GetBytes("-----IV_HERE----");
int neg = -1;
decryptIV[(counter % 16)]++;
Aes128CounterMode amD;
ICryptoTransform ictD;
amD = new Aes128CounterMode(decryptIV);
ictD = amD.CreateDecryptor(decryptKey, null);
ictD.TransformBlock(status, 0, 64, tempData, 0);
s = System.Text.Encoding.UTF8.GetString(tempData);
neg = s.IndexOf("-");
if (neg != -1)
{
Int32.TryParse(s.Substring(neg), out ret);
}
else
{
Int32.TryParse(s, out ret);
}
return(ret);
}
//ENCRYPTION FOR CTR MODE
private static byte[] encryptData(byte[] data, int counter)
{
byte[] encrypted = new byte[1024];
byte[] tempdata = new byte[64];
byte[] plaintext = new byte[1024];
byte[] tempPlain = new byte[64];
int i = 0;
byte[] encryptKey = Encoding.UTF8.GetBytes("----KEY_HERE----");
byte[] encryptIV = Encoding.UTF8.GetBytes("-----IV_HERE----");
//Do we need to pad the data?
if (data.Length != 1024)
{
Array.Copy(data, plaintext, data.Length);
for (i = data.Length; i < (plaintext.Length - data.Length); i++)
{
plaintext[i] = 0x00;
}
}
else
{
plaintext = data.ToArray();
}
encryptIV[(counter % 16)]++;
Aes128CounterMode am;
ICryptoTransform ict;
am = new Aes128CounterMode(encryptIV);
ict = am.CreateEncryptor(encryptKey, null);
ict.TransformBlock(plaintext, 0, 1024, encrypted, 0);
return(encrypted);
}
private static byte[] decryptData(byte[] data, int counter)
{
string s;
byte[] decrypted = new byte[1024];
byte[] decryptKey = Encoding.UTF8.GetBytes("----KEY_HERE----");
byte[] decryptIV = Encoding.UTF8.GetBytes("-----IV_HERE----");
decryptIV[(counter % 16)]++;
Aes128CounterMode amD;
ICryptoTransform ict;
amD = new Aes128CounterMode(decryptIV);
ict = amD.CreateDecryptor(decryptKey, null);
ict.TransformBlock(data, 0, 1024, decrypted, 0);
s = System.Text.Encoding.UTF8.GetString(decrypted);
return(decrypted);
}
